[nossralf]

http://www.ansn-jp.org/jneslibrary/npp2.pdf

That PDF has a schematic of the containment building on page 4. The "MARK-I" image corresponds to the Fukushima I-1 building.

[uvdiv]

More detailed cutaways:

http://i.imgur.com/Oj4kg.png

http://i.imgur.com/CckjP.jpg

from, respectively,

Madgi Ragheb, UIUC https://netfiles.uiuc.edu/mragheb/www/NPRE%20457%20CSE%20462...

NRC http://www.nrc.gov/reading-rm/basic-ref/teachers/03.pdf